Fix handling of --system-specs argument so it happens before Application::new (#29240)

Fixes issue described in [description of
#28683](https://github.com/zed-industries/zed/issues/28683#issue-2992849891)

Makes sure that the `--system-specs` arg is handled before
`Application::new` is called, so that it can be used even when Zed is
panicking during app initialization (e.g. Failing to create a Vulkan
context in blade)

Release Notes:

- Fixed an issue where the `--system-specs` arg wouldn't work if Zed
panicked during app initialization (e.g. When failing to create a Vulkan
context in blade)

crates/remote_server/src/unix.rs

@@ -428,7 +428,7 @@ pub fn execute_run(
     let git_hosting_provider_registry = Arc::new(GitHostingProviderRegistry::new());
     gpui::Application::headless().run(move |cx| {
         settings::init(cx);
-        let app_version = AppVersion::init(env!("ZED_PKG_VERSION"));
+        let app_version = AppVersion::load(env!("ZED_PKG_VERSION"));
         release_channel::init(app_version, cx);
         gpui_tokio::init(cx);